Electromagnetic coupling device

An electromagnetic coupling device comprising an electromagnet that is equipped with a coil bobbin that has a magnetizing coil wound in multiple turns, a surrounding section in which is formed an annular groove into which this magnetizing coil fits, and a columnar terminal holder section with a pair of insertion holes into which the starting end of the wound section and the final end of the wound section of the aforementioned magnetizing coil are inserted;

• a yoke that has an annular groove that opens in the same direction as the annular groove of this coil bobbin and a through-hole through the bottom of this annular groove, and in which the enclosing section of the aforementioned coil bobbin is engaged in the aforementioned annular groove and in which the terminal holder section of the aforementioned coil bobbin is inserted through the aforementioned through-hole;
• a pair of open sections through the aforementioned terminal holder section of the aforementioned coil bobbin that is mounted on the back of the aforementioned yoke;
• a pair of terminals that have first connection sections that are connected to each end section of the aforementioned magnetizing coil inserted into the aforementioned insertion holes inside the aforementioned open sections;
• a voltage surge absorption element mounted between the second connection sections of these terminals;
• an enclosing member in which each of the second connection sections of the aforementioned pair of terminals and the aforementioned voltage surge absorption element are embedded and integrally secured;
• and a terminal housing with which the third connection sections of the aforementioned pair of terminals project externally, and, at the same time, with which the aforementioned enclosing member and the aforementioned coil bobbin terminal holder section are covered.